本文選題：數(shù)字印刷　切入點(diǎn)：表面張力　出處：《華南理工大學(xué)》2013年博士論文

【摘要】：隨著數(shù)字印刷技術(shù)的快速發(fā)展,壓電噴墨技術(shù)作為一種經(jīng)濟(jì)、耐用、高效的噴墨技術(shù)得到廣泛應(yīng)用。噴墨墨滴作為圖像復(fù)制的基本單元,承擔(dān)著圖像組成、階調(diào)再現(xiàn)以及顏色復(fù)制的基本功能,在印刷復(fù)制技術(shù)中有著重要的地位。噴墨墨滴的形成、墨滴在介質(zhì)中的飛行軌跡、墨點(diǎn)在飛行過程中的形態(tài)變化,墨滴在承印物表面的干燥特性以及墨滴到達(dá)承印物后的狀態(tài),都是影響墨滴在印刷復(fù)制中的各種功能的基本因素。而壓電噴墨技術(shù)作為數(shù)字噴墨技術(shù)的主要方式之一,其產(chǎn)生墨滴尺寸的大小以及尺寸的穩(wěn)定性,墨滴產(chǎn)生過程中拖尾現(xiàn)象的出現(xiàn)以及由此產(chǎn)生的衛(wèi)星墨滴,墨滴產(chǎn)生瞬間的速度,墨滴飛行過程中的動(dòng)態(tài)表面張力等都將是數(shù)字壓電噴墨技術(shù)的研究?jī)?nèi)容。簡(jiǎn)言之,噴墨過程的研究是為了實(shí)現(xiàn)噴墨過程的可控化,標(biāo)準(zhǔn)化和高速化。本論文立足于射流基礎(chǔ)理論,通過建立數(shù)學(xué)模型,計(jì)算機(jī)模擬和實(shí)驗(yàn)研究對(duì)噴墨過程進(jìn)行了系統(tǒng)研究,得出了有效模擬數(shù)字壓電噴墨墨滴產(chǎn)生的數(shù)學(xué)模型。在墨滴產(chǎn)生的基礎(chǔ)理論上對(duì)墨滴在移動(dòng)承印物上的形態(tài)、墨滴飛行軌跡、墨滴干燥以及墨滴動(dòng)態(tài)表面張力等問題進(jìn)行了深入研究,取得了一定的成果。論文的主要工作和創(chuàng)新點(diǎn)包括： (1)對(duì)噴墨過程進(jìn)行了理論建模,確定了模型的邊界條件,并在設(shè)定的邊界條件下對(duì)方程求解,得出了噴墨墨滴的理論參數(shù)值,然后通過Fluent軟件在相同邊界條件下對(duì)噴墨過程進(jìn)行模擬,得出了與理論計(jì)算結(jié)果較為接近的模擬值,最后通過實(shí)驗(yàn)驗(yàn)證了數(shù)學(xué)模型在墨滴產(chǎn)生過程中能夠有效模擬噴墨過程的結(jié)論。 (2)建立了壓電噴墨數(shù)學(xué)模型,分析了油墨表面張力、物理粘度、油墨壓力等參數(shù)對(duì)墨滴狀態(tài)的影響。詳細(xì)討論了表面張力在墨滴形成過程中的作用,尤其是在相同條件下,油墨表面張力與墨滴形成過程之間的關(guān)系。 (3)深入研究了壓電噴墨墨滴飛行軌跡。通過建立數(shù)學(xué)模型分析在水平和垂直狀態(tài)下墨滴的飛行狀態(tài)及飛行軌跡,最后通過實(shí)驗(yàn)驗(yàn)證了該方法的可行性。 (4)針對(duì)正在研發(fā)階段的卷筒料數(shù)字噴墨設(shè)備,本論文討論了在承印物移動(dòng)狀態(tài)下墨點(diǎn)的定位特性該模型能夠有效的判斷在承印物移動(dòng)狀態(tài)下的噴墨質(zhì)量。 (5)對(duì)墨滴的快速干燥問題做了深入探討,建立了基于烘干熱風(fēng)風(fēng)速和溫度的油墨干燥數(shù)學(xué)模型,為解決高速噴墨印刷干燥問題提供了理論依據(jù),并在此基礎(chǔ)上設(shè)計(jì)了一種高效的油墨烘干裝置。 (6)提出了一種基于墨滴輪廓擬合的表面張力計(jì)算方法,該方法是一種有效的獲得油墨動(dòng)態(tài)表面張力方法。 最后,對(duì)本文的主要內(nèi)容以及所取得的主要研究成果進(jìn)行概括性總結(jié),并對(duì)論文中存在的不足進(jìn)行了分析探討,為后續(xù)的研究工作提出了一些個(gè)人見解。
[Abstract]:With the rapid development of digital printing technology, piezoelectric inkjet technology as an economic, durable, efficient inkjet technology has been widely used. The basic functions of tone reproduction and color reproduction play an important role in printing reproduction technology. The formation of inkjet droplets, the flight path of ink drops in the medium, and the morphological changes of ink points during flight, The drying characteristics of ink droplets on the substrate surface and the state of ink droplets reaching the substrate are the basic factors that affect the functions of ink droplets in printing reproduction. Piezoelectric ink jet technology is one of the main methods of digital ink jet technology. The size and stability of the droplet produced, the appearance of the tail phenomenon during the droplet generation and the resulting satellite droplet, the instantaneous speed of the droplet, The dynamic surface tension in the flying process of ink droplets will be the research content of digital piezoelectric inkjet technology. In short, the research of ink jet process is to realize the controllability of ink jet process. Standardization and high speed. Based on the basic theory of jet, this paper systematically studies the inkjet process by establishing mathematical model, computer simulation and experimental research. The mathematical model of the effective simulation of the digital piezoelectric ink jet droplet is obtained. In the basic theory of the ink droplet generation, the shape of the ink drop on the moving substrate, the droplet flight path, The problems of droplet drying and droplet dynamic surface tension have been deeply studied, and some achievements have been obtained. The main work and innovations of this paper include:. 1) the theoretical modeling of the ink jet process is carried out, the boundary conditions of the model are determined, and the equations are solved under the given boundary conditions, and the theoretical parameters of the ink jet droplet are obtained. Then the ink-jet process is simulated under the same boundary condition by Fluent software, and the simulation value is obtained, which is close to the theoretical calculation result. Finally, the conclusion that the mathematical model can effectively simulate the ink jet process in the process of ink droplet generation is verified by experiments. (2) the mathematical model of piezoelectric ink jet is established, and the influence of the parameters of ink surface tension, physical viscosity and ink pressure on the droplet state is analyzed. The effect of surface tension on the formation of ink droplets is discussed in detail, especially under the same conditions. Ink surface tension and ink droplet formation process. (3) the flight trajectory of piezoelectric ink jet droplet is studied in depth, and the flying state and trajectory of the droplet in horizontal and vertical state are analyzed by establishing mathematical model. Finally, the feasibility of the method is verified by experiments. This paper discusses the localization characteristics of ink points in the state of substrate movement. The model can effectively judge the quality of ink jet in the state of substrate movement. In this paper, the rapid drying of ink droplets is discussed, and the mathematical model of ink drying based on drying hot air velocity and temperature is established, which provides a theoretical basis for solving the problem of high speed inkjet printing drying. On this basis, an efficient ink drying device is designed. A method for calculating surface tension based on the profile fitting of ink droplets is proposed, which is an effective method for obtaining dynamic surface tension of ink. Finally, the main contents of this paper and the main research results are summarized, and the shortcomings of the paper are analyzed and discussed, and some personal opinions are put forward for the subsequent research work.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類號(hào)】：TS853.5

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本文編號(hào)：1693973